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diff --git a/Marlin/src/feature/bedlevel/abl/abl.h b/Marlin/src/feature/bedlevel/abl/abl.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../../../inc/MarlinConfigPre.h"
+
+extern xy_pos_t bilinear_grid_spacing, bilinear_start;
+extern xy_float_t bilinear_grid_factor;
+extern bed_mesh_t z_values;
+float bilinear_z_offset(const xy_pos_t &raw);
+
+void extrapolate_unprobed_bed_level();
+void print_bilinear_leveling_grid();
+void refresh_bed_level();
+#if ENABLED(ABL_BILINEAR_SUBDIVISION)
+  void print_bilinear_leveling_grid_virt();
+  void bed_level_virt_interpolate();
+#endif
+
+#if IS_CARTESIAN && DISABLED(SEGMENT_LEVELED_MOVES)
+  void bilinear_line_to_destination(const feedRate_t &scaled_fr_mm_s, uint16_t x_splits=0xFFFF, uint16_t y_splits=0xFFFF);
+#endif
+
+#define _GET_MESH_X(I) float(bilinear_start.x + (I) * bilinear_grid_spacing.x)
+#define _GET_MESH_Y(J) float(bilinear_start.y + (J) * bilinear_grid_spacing.y)
+#define Z_VALUES_ARR  z_values